.flashcard-container {
    float: left;
    padding: 0;
    margin: 0;
}

.flashcard-container li {
    float: left;
    margin: 6px;
    position: relative;
    display:inline;
}

.flashcard-container li div {
    overflow: hidden;
    position: absolute;
    border: none;
    border-radius:10px;
    -webkit-border-radius:10px;
    padding: 10px;
    background: lightGray;
}

.flashcard-container li div.back {
    left: -999em;
    background: black;

}

.flashcard-container li div h2{
    display: block;
    padding: 10px;
}

.flashcard-container li div.back h2{
    color: white;
}